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4.
(n)the basic unit of thermodynamic temperature adopted under the Systeme International d''Unites

5.
(n)the cardinal number that is the product of 10 and 100

6.
(n)a light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite